111221200 has 60 divisors (see below), whose sum is σ = 269952588. Its totient is φ = 44032000.

The previous prime is 111221197. The next prime is 111221207. The reversal of 111221200 is 2122111.

It can be written as a sum of positive squares in 6 ways, for example, as 17673616 + 93547584 = 4204^2 + 9672^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39024 + ... + 41776.

Almost surely, 2^111221200 is an apocalyptic number.

111221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134976294).

111221200 is an abundant number, since it is smaller than the sum of its proper divisors (158731388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111221200 is a wasteful number, since it uses less digits than its factorization.

111221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 111221200 is about 10546.1462155614. The cubic root of 111221200 is about 480.9085800124.

Adding to 111221200 its reverse (2122111), we get a palindrome (113343311).

The spelling of 111221200 in words is "one hundred eleven million, two hundred twenty-one thousand, two hundred".